GroundRosterSeptic System Installation: Licensed Septic Installers Based in Thornton, NH
11 of the 12 licensed listings based in Thornton hold a New Hampshire license class that covers this work: they are licensed to build and install septic tanks and drainfields, and repair or replace failed ones. Not every well and septic professional is; see all Thornton listings for the full roster.
"Based in" is the city on the business's state license record. That can be a mailing address; it doesn't tell you where the business works.
Shane JohnstonLicensed
Valerie JohnstonLicensed
Neil NoseworthyLicensed
Ronald FarnsworthLicensed
Dean JohnstonLicensed
Mark JohnstonLicensed
Larry BenoitLicensed
John KubikLicensed
Duane JohnstonLicensed
Deven McIverLicensed
Coleman CawleyLicensed
What does septic system installation cost?
A conventional septic system typically costs $3,600 to $12,500 installed. Alternative systems (aerobic, mound) for difficult sites run $10,000 to $20,000. Soil conditions drive most of the difference, which is why a soil or percolation test comes first.
Do I need a permit to install or replace a septic system?
Almost always. Your state or county health authority must permit new systems and most repairs, and the design has to match a soil evaluation of your site. Licensed installers usually handle permitting as part of the job; confirm it is included in the quote.
Before you hire
Confirm the license number on this page is still active with New Hampshire, ask for proof of insurance, and get at least three written quotes; pricing on this work varies widely by site conditions.